The boxes I saw in Canterbury were the Mandrake ones, the same than those you can find in France (but in English, of course).
When you look, see if the box has any mention of McMillian Publishing. THese are the same company that puts out "Que" books, and at one time was the USA (possibly IIRC for the English language Areas version) distributor for MDK, and may still be.
Eric
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